Radio mirror (Jan-Oct 1923)

May 5, 1923 RADIO DIGEST 15 Questions and Answers loos© Coupler (2429) CK, Marvel. N. D. In a loose coupler, is the secondary and primary coil connected together in any way by wire? What is the use of the rods that the secondary coil slides on? Are they necessary? How do you tune in a station on a crystal set using a loose coupler? I live 15 miles from a sending station. Will a 75-ohm receiver be all right to use? Are the vacuum tubes known as the W-ll the tubes that are used with dry cells. A. — Answering your inquiry, will advise that primary and secondary of loose coupler are not connected in any way. Rods are merely used to support the secondary coil, although sometimes the wires from the secondary coll are connected to them for appearance sake. Not necessarily, however. Tuning is accomplished by experimentation until receiving wave length of broadcasting station desired. It is largely a matter of patience and practice till accomplished. A seventy-five ohm headset is not very efficient. Better have a three thousand ohm set if possible. WD11 tubes are used with dry cells, as suggested. Ultra Audion Hook-Up (35 IS) IMA, New Orleans, La. Please give me the ultra audion hook-up. I believe it is the same one certain publications are misnaming the "Gibbons" and names of other so-called inventors who do not deserve the credit. A. — Hook-up. is given herewith. Dr Lee DeForest is responsible for the discovery of the ultra audion circuit and to him all credit belongs. You are right in saying the other "inventors" do not deserve falsely claimed credit. Wight and Day Reception (2362) NG, Philadelphia, Pa. I am using Radio frequency amplification with various types of transformers and receiving throughout the whole day long distance fine, but as soon as night gets on a terrible static is dropping in my receivers and the noise is so great that I cannot receive any distant station except city stuff. I'm using three steps of R. F. and detector three steps of A. F. amplification. Please help me settle my problem. I'm using about 100 ft. single wire aerial 30 ft. 'high. A. — Noting difficulties experienced in night reception will advise that this is contrary to theory and precedent. Reception should far excel that obtained during daytime. It is indicated that there is disturbance occasioned by electrical apparatus in your proximity. Possibly a faulty arc light adjacent to your set. It is not a static disturbance, as suggested. Tour antenna construction is good. t FLEWELLiNG ALL PARTS NECESSARY DEALERS: ATTRACTIVE DISCOUNTS 123 W.Madixonlt.Chicaqo We WiOail .You One SYNTHETIC RADIO CRYSTAL COMPARE IT WITH WHAT YOU ARE NOW USING OURS IS BETTER MAIL US 3 0 CENTS NOT Return itatOur Expensej IZob elStein laboratories' §229-™ ST. BR00KLYN.N.V. South 265fi IF directions on them, Relnortz Hook-Up I howls, etc. I have followed ("571) SHL, San Bernadino, Calif. very carefully and checked up Some few issues back you printed a not once but several times, photo-diagram of the Reinartl with a| A. — The figure two diagram appearing ANTetfNA hook-up in panel layout form showing the instruments connected on a panel. Can you repeat this hook-up? A. — The hook-up was given in the issue of January 13 and is repeated again herewith. Choke Coils and Transformers (2318) EAL, Plymouth, 111. I would like to ask a few questions regarding the Reflex circuit No. 3 of the January 27th issue. Could I get as good results by using an R. F. transformer in place of the choke coil and high resistance? What tubes would be best for this circuit. Could the W. E. 2 16 A tubes be used? If so what plate voltage should they require? Would it be possible to light the filament and furnish the plate voltage off the 60 cycle A. C? What is the wavelength range? A. — In reference to the Reflex circuit would advise that Radio frequency transformer may be used effectively in place of the choke coil and high resistance. TJ V 201 tubes will serve satisfactorily in this circuit. W E 216A tubes may be used with about ninety volts plate potential. It is possible to light filament from A C supply by employment of rectifiers and transformers. The wave length range is about one hundred and ninety to six hundred meters. Squeals and Howls (2867) RLB, New York City. In your issue of January 27, on page 13 you published a hook up figure 2. I have built this set, and am writing you to see if you elin give me some information as to the tuning of it. The local stations come in very fair (although not as good as a 3 bulb set that I have) and I have only been able to get WDAP Chicago for distance. I get any amount of squeals. GUARANTEED VACUUM TUBES V/2 Volt Detectors $3.95 1M Volt Detectors and Amplifiers 4J(5 6 Volt Detectors and Amplifiers 3.25 Above Tubes shipped prepaid WE REPAIR YOUR BURNT OUT VACUUM TUBES Quick Service WD-11 $3 JO UV-2M-A ....$3.50 UV-209 2.75 UV-ZB1 3.00 When sending Tubes for repair Include with your remittance parcel postage for one pound. Tubes guaranteed equal to new. Abalene Radio 416 D Broadway New York, N. Y. DON'T PASS THIS-BUY.T DO Every World Uaerbal K». Booster | ^^P Because you deal direct with a manu~ ' facturer who is responsible for the performance and quality of the Battery. WRITTEN 2 YEA1 GUARANTEE World-Radio-Batteries 6 Volts — 40 Amps., $8.50 6 Volts— 60 Amps., 6 Volts — 80 Amps., $12.50 C Volts— 100 Amps., $10.00 $14.50 S Volts $16.00 120 Amps. Full Rating Guaranteed MAIL YOUR ORDER TODAY. WE SHIP EXPRESS C. 0. D.. SUBJECT TO INSPECTION. OR WILL ALLOW 5% FOR CASH WITH ORDER. ALL ORDERS SHIPPED SAME DAY AS RECEIVED. WORLD BATTERY COMPANY, 60 E. Roosevelt R<L, Dept. L, Chicago, 111. in the January 27th issue of Radio Digest is correct and has given splendid results. It is indicated that a discrepancy exists, possibly inefficient apparatus, since you do not experience the satisfaction afforded to others. It is difficult to suggest the source of limitation without a personal inspection of set, but having assured you of its possibilities we trust you will not be discouraged before you locate your trouble. Reflex without Crystal (2940) PW, New York City, N. Y. I have made your one tube Reflex. All local stations come in clear and loud on an indoor aerial. I can also receive these stations very faint when I disengage the cat whisker. What is the cause of this? Can a third R. F. transformer be used in the three tube Reflex? If so where is the best position for it? These two sets were published in the December 30th, 1922 issue. Do you sell old issues of the Radio Digest, and what is the price? What numbers contain Reflex circuits? A. — With reference to Reflex circuit will advise that action of same when cat whisker is disengaged is due to inductance between various parts and does not interfere with operation. For addition of a third Radio frequency transformer in this circuit we are directing your attention to page thirteen of the January 27th issue of Radio Digest for diagram showing method. January 20th issue also contains data on this. Back numbers of Radio Digest can be secured, unless exhausted, at ten cents a copy. Resistances (2852) WGG, Chicago, 111. I desire to build the Reflex circuit as described in your January 27th issue, page 13, figure 1. Please tell me how or where to purchase the 50,000 ohm resistances as described and how to make them? I find it almost impossible to secure these resistances. I wish to use three Federal R. F. and two Atwater Kent 9 to 1 ratio A. !•'. transformers. Will these high resistances be of any advantage in this set? Am I using good judgment in selecting high ratio transformers? Do you consider circuit No. 3 better than No. 1? I do not quite understand why a jack such as described in this circuit on the second A. F. is used. A. — Resistances employed may be secured through any responsible dealer. Would advise the use of lower ratio audio frequency transformers than the 9 to 1 cited. Three and one-half or four to one. Personally, circuit number one is preferred. If your reference is to jack used on second stage of audio frequency on number three, this is error. Base of jack should be connected to first prong. SOMETHING NEW A real loud Talking Detector^ made of "B" Metal. 100% j superior to I any crystal.! Puts new life into! your set.' Guaranteed for one year. It's the cheapest in the long run. Sold by all live dealers, or can be ordered from the B-Metal Refining Co. 3134 Trumbull Ave. Detroit, Mich. 50c r4gm%m®sm Bound Volumes Numbers Two, Three, or Four Postpaid by Parcel Post with One Year's Subscription to Radio Digest M ?0 v*; %$? 0 m fH*5 m& &fj^ n i\ :-Vo' \utt*V «r; tvp^r^o^. «v m •s? £ & />o INuraber Greatest Collection of Radio Information Ever Published Reinartz Long Distance Circuit UltraReinartz Circuit Flewelling "Flivver" Circuit Grimes "Inverse Duplex" Circuit Single Tube Reflex Circuit _. Armstrong "SuperHeterodyne" Circuit Two, Three and Four Tube Reflex A B. C. Lessons for Radio Beginners In addition to these features these rohimes contain many instructive articles, receiving set diagrams, how to make articlee, new apparatus, pictures and illustrations, hook-up diagrams, broadcasting stations, technical articles and book reviews. VOLS. TWO, THREE & FOUR Now Ready for Delivery. Par «iO ftf\ eel Post Prepaid. Each. 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